Like can be used as a conjuction.
It looks like it's about to rain. -.is not wrong.
Or as a noun. - I stacked like with like in the toy shelf.
As a preposition. - My brother had a toy like that.
And as an adjective. - I answered in like tone of voice.
Like used as an informal adverb is not correct.
It came out sunny and rainy like.
He saw the sky and was like, "Where is the rain?".
This last usage of LIKE is what is common amongst young people and I hate it.